A soft and hard anti-deformation multi-layer fiber structure of ramie and its preparation method

Abstract

The present invention relates to the technical field of layered products, specifically to a soft and hard anti-deformation multilayer fiber structure of ramie and its preparation method, including forming an antibacterial hollow fiber stack; forming a ramie fiber stack; forming a fiber interlaced layer; placing the fiber interlaced layer in a rectangular enclosure, and making the antibacterial hollow fiber composite layer face up; combing, laying and needle-punching the ramie fibers, immersing the formed initial layer of ramie fibers in glue and oscillating, taking it out and putting it in a rectangular enclosure, hot pressing and curing to shape, forming an elastic ramie fiber composite layer on the front of the antibacterial hollow fiber composite layer, taking it out and fine trimming, and obtaining a ramie anti-deformation multilayer fiber structure. The ramie anti-deformation multilayer fiber structure in the present invention is a layered product composed of an elastic fiber composite layer, an antibacterial hollow fiber composite layer and a ramie fiber composite layer interlaced, which has the characteristics of moderate hardness and softness, high fit to the human body, excellent air permeability and warmth retention, and good antibacterial performance.

Description

Technical Field

[0001] The invention relates to the technical field of layered products, in particular to a soft and hard anti-deformation multi-layer fiber structure of ramie and a preparation method thereof. Background Art

[0002] Sleep is the guarantee of human energy and physical recovery, and has an important impact on human physiological and mental health, work and study efficiency, quality of life, social interaction, etc. As a sleeping platform, the mattress also has an important impact on sleep quality. Mattress structures are made of a variety of materials, and the types of mattress structures used are gradually becoming diversified, mainly including spring mattress structures, fiber mattress structures, latex mattress structures, sponge mattress structures, etc.

[0003] The latex mattress structure has good elasticity, a high degree of fit with the human body, and can relieve body pressure, but the latex mattress structure is relatively soft, which makes it difficult to provide appropriate support according to the body curve. Sleeping for a long time can easily cause back pain and other problems, and its price is relatively high, which is not conducive to widespread use. The hemp fiber mattress structure has good antibacterial and breathable properties and low production costs, but the hemp fiber mattress structure is relatively hard and cannot fit the human body well, resulting in poor sleeping comfort. Based on this, a hemp fiber anti-deformation multi-layer fiber structure with both soft and hard properties and a preparation method thereof are proposed. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a hemp anti-deformation multi-layer fiber structure with both soft and hard properties and a preparation method thereof. The layered product is composed of an elastic fiber composite layer, an antibacterial hollow fiber composite layer and a hemp fiber composite layer that are staggered and distributed. The layered product has the characteristics of moderate hardness and softness, high fit to the human body, excellent air permeability and warmth retention, and good antibacterial performance.

[0005] To achieve the above object, the present invention provides the following technical solution: a soft and hard anti-deformation multi-layer fiber structure of hemp, comprising an elastic hemp fiber composite layer, an antibacterial hollow fiber composite layer and a hemp fiber composite layer are arranged at the bottom of the elastic hemp fiber composite layer, and the antibacterial hollow fiber composite layer and the hemp fiber composite layer are arranged in two layers respectively;

[0006] The elastic hemp fiber composite layer is composed of microporous latex and hemp fiber;

[0007] The antibacterial hollow fiber composite layer is composed of antibacterial hollow fibers and low melting point fibers;

[0008] The hemp fiber composite layer consists of hemp fiber and low melting point fiber.

[0009] Preferably, the thickness of the elastic hemp fiber composite layer accounts for 30-50% of the total thickness of the hemp anti-deformation multilayer fiber structure, the thickness of the antibacterial hollow fiber composite layer accounts for 10-20% of the total thickness of the hemp anti-deformation multilayer fiber structure, and the thickness of the hemp fiber composite layer accounts for 30-60% of the total thickness of the hemp anti-deformation multilayer fiber structure.

[0010] Preferably, the low melting point fiber is high elastic 4080 fiber.

[0011] Preferably, by mass percentage, in the antibacterial hollow fiber composite layer, the antibacterial hollow fibers account for 75-85%, and the low-melting point fibers account for 15-25%; in the hemp fiber composite layer, the hemp fibers account for 80-90%, and the low-melting point fibers account for 10-20%.

[0012] Preferably, the preparation method of the antibacterial hollow fiber is as follows: S1, immersing the polyester hollow fiber in a sodium hydroxide solution, treating it at 50-60°C for 40-50 minutes, filtering, washing, and drying to obtain a pretreated polyester hollow fiber; S2, immersing the pretreated polyester hollow fiber in a zinc acetate solution, stirring and adding a sodium hydroxide solution to adjust the pH to 8-9, and oscillating for 5-7 hours, filtering, washing, and baking to obtain an antibacterial hollow fiber.

[0013] Preferably, in step S1, the mass ratio of the polyester hollow fiber to the sodium hydroxide solution is 1:4; and the mass fraction of the sodium hydroxide solution is 5%.

[0014] Preferably, in step S2, the mass ratio of the pretreated polyester hollow fiber to the zinc acetate solution is 1:3; the concentration of the zinc acetate solution is 20 g / L; the mass fraction of the sodium hydroxide solution is 20%; and the baking temperature is 155°C.

[0015] The present invention also provides a method for preparing a soft and hard multi-layer fiber structure of ramie anti-deformation, comprising the following steps:

[0016] (1) The antibacterial hollow fiber and the low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, an antibacterial hollow fiber laminate is formed;

[0017] (2) The hemp fiber and the low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed;

[0018] (3) respectively taking two groups of antibacterial hollow fiber laminates and two groups of hemp fiber laminates, stacking the two groups alternately, and hot pressing to form a fiber interlaced layer consisting of an antibacterial hollow fiber composite layer and a hemp fiber composite layer;

[0019] (4) Place the fiber interlaced layer into a rectangular enclosure with the antibacterial hollow fiber composite layer facing upward;

[0020] (5) The hemp fibers are combed, webbed and needled, and the formed initial layer of hemp fibers is immersed in glue and oscillated for 20-30 minutes. The fibers are taken out and placed in a rectangular enclosure, and hot-pressed to cure and shape them. An elastic hemp fiber composite layer composed of microporous latex-coated hemp fibers is formed on the front side of the antibacterial hollow fiber composite layer. The fibers are taken out and finely trimmed to obtain a hemp deformation-resistant multilayer fiber structure.

[0021] Preferably, in step (5), the preparation method of the mortar is as follows: weigh 70-80% natural latex, 20-25% nano zinc oxide, 1-2% calcium chloride, 1-2% sodium bicarbonate and 0.5-1% sulfur in percentage by mass, and stir evenly to obtain the mortar.

[0022] Preferably, the water content of the natural latex is 50%.

[0023] The present invention provides a soft and hard anti-deformation multi-layer fiber structure of ramie and a preparation method thereof, which has the following beneficial effects compared with the prior art:

[0024] The anti-deformation multilayer fiber structure of ramie in the present invention is a layered product composed of an elastic fiber composite layer, an antibacterial hollow fiber composite layer and a ramie fiber composite layer staggeredly distributed, and has the characteristics of moderate hardness and softness, high fit with the human body, excellent air permeability and warmth retention, good antibacterial performance, etc. Specifically, by immersing the ramie fiber in glue and treating it, a microporous latex layer is wrapped on the surface of the ramie fiber, so that the ramie fiber is connected through the solidified microporous latex structure to form an elastic fiber composite layer, the problem of the ramie fiber composite layer itself being too hard and the latex layer itself being too soft is solved, and the hardness and softness are moderate; moreover, by the treatment method of immersing the ramie fiber in glue, the amount of glue used can also be reduced, thereby reducing the production cost of the anti-deformation multilayer fiber structure of ramie.

[0025] The present invention performs alkali treatment on the polyester hollow fiber, so that the polyester hollow fiber macromolecules are hydrolyzed, and the ester bonds are broken to form carboxyl groups and hydroxyl groups, so that the polyester hollow fiber has a negative charge, which is opposite to the charge property of the nano zinc oxide colloid. The two attract each other, which is conducive to the sufficient deposition of nano zinc oxide and loading inside and outside the polyester hollow fiber, thereby improving the antibacterial performance of the anti-deformation multi-layer fiber structure of ramie. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 This is a schematic diagram of the deformation-resistant multi-layer fiber structure of ramie of the present invention. DETAILED DESCRIPTION

[0028] The following examples are used to explain the implementation methods of the present application in detail, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0029] Example 1

[0030] The preparation method of the antibacterial hollow fiber is as follows:

[0031] S1. Immersing the polyester hollow fiber in a 5 wt % sodium hydroxide solution at a mass ratio of 1:4, treating at 60° C. for 40 min, filtering, washing, and drying to obtain a pretreated polyester hollow fiber;

[0032] S2. Immerse the pretreated polyester hollow fiber in a 20 g / L zinc acetate solution at a mass ratio of 1:3, add 20 wt% sodium hydroxide solution with stirring to adjust the pH to 9, and oscillate for 5 hours. After filtering, washing, and baking, control the baking temperature to 155°C to obtain an antibacterial hollow fiber.

[0033] Example 2

[0034] The preparation method of the antibacterial hollow fiber is as follows:

[0035] S1. Immersing the polyester hollow fiber in a 5 wt % sodium hydroxide solution at a mass ratio of 1:4, treating at 50° C. for 50 min, filtering, washing, and drying to obtain a pretreated polyester hollow fiber;

[0036] S2. Immerse the pretreated polyester hollow fiber in a 20 g / L zinc acetate solution at a mass ratio of 1:3, add 20 wt % sodium hydroxide solution to adjust the pH to 8 with stirring, and oscillate for 7 hours. After filtering, washing, and baking, control the baking temperature to 155°C to obtain an antibacterial hollow fiber.

[0037] Example 3

[0038] The preparation method of the mortar is as follows: by mass percentage, weigh 71.5% of natural latex with a water content of 50%, 25% of nano zinc oxide, 1% of calcium chloride, 2% of sodium bicarbonate and 0.5% of sulfur, and stir them evenly to obtain the mortar.

[0039] Example 4

[0040] The preparation method of the mortar is as follows: by mass percentage, weigh 76% of natural latex with a water content of 50%, 20% of nano zinc oxide, 2% of calcium chloride, 1% of sodium bicarbonate and 1% of sulfur, and stir them evenly to obtain the mortar.

[0041] Example 5

[0042] A method for preparing a soft and hard multi-layer fiber structure of ramie anti-deformation, comprising the following steps:

[0043] (1) The antibacterial hollow fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, an antibacterial hollow fiber laminate is formed; in terms of mass percentage, the antibacterial hollow fiber accounts for 85% and the high-elastic 4080 low-melting-point fiber accounts for 15% in the antibacterial hollow fiber composite layer;

[0044] (2) The hemp fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after being combed, laid and needle-punched, a hemp fiber laminate is formed; in terms of mass percentage, the hemp fiber accounts for 90% and the high-elastic 4080 low-melting-point fiber accounts for 10% in the hemp fiber composite layer.

[0045] (3) respectively taking two groups of antibacterial hollow fiber laminates and two groups of hemp fiber laminates, stacking the two groups alternately, and hot pressing to form a fiber interlaced layer consisting of an antibacterial hollow fiber composite layer and a hemp fiber composite layer;

[0046] (4) Place the fiber interlaced layer into a rectangular enclosure with the antibacterial hollow fiber composite layer facing upward;

[0047] (5) The hemp fibers are combed, laid and needled. The formed initial layer of hemp fibers is immersed in glue and oscillated for 20 minutes. The fibers are taken out and placed in a rectangular enclosure and hot-pressed to cure and shape them. An elastic hemp fiber composite layer composed of microporous latex coated hemp fibers is formed on the front side of the antibacterial hollow fiber composite layer. The fibers are taken out and finely trimmed to obtain a hemp deformation-resistant multilayer fiber structure.

[0048] In this embodiment, the antibacterial hollow fiber prepared in Example 1 and the mortar prepared in Example 3 were used.

[0049] In this embodiment, the prepared hemp deformation-resistant multilayer fiber structure comprises, from top to bottom, an elastic hemp fiber composite layer, an antibacterial hollow fiber composite layer, a hemp fiber composite layer, an antibacterial hollow fiber composite layer, and a hemp fiber composite layer.

[0050] The thickness of the elastic hemp fiber composite layer accounts for 30% of the total thickness of the hemp anti-deformation multi-layer fiber structure, the thickness of the antibacterial hollow fiber composite layer accounts for 10% of the total thickness of the hemp anti-deformation multi-layer fiber structure, and the thickness of the two groups of antibacterial hollow fiber composite layers is the same. The thickness of the hemp fiber composite layer accounts for 60% of the total thickness of the hemp anti-deformation multi-layer fiber structure, and the thickness of the two groups of hemp fiber composite layers is the same.

[0051] Example 6

[0052] A method for preparing a soft and hard multi-layer fiber structure of ramie anti-deformation, comprising the following steps:

[0053] (1) The antibacterial hollow fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, an antibacterial hollow fiber laminate is formed; in terms of mass percentage, the antibacterial hollow fiber accounts for 75% and the high-elastic 4080 low-melting-point fiber accounts for 25% in the antibacterial hollow fiber composite layer;

[0054] (2) The hemp fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after being combed, laid out and needle-punched, a hemp fiber laminate is formed; in terms of mass percentage, the hemp fiber accounts for 80% and the high-elastic 4080 low-melting-point fiber accounts for 20% in the hemp fiber composite layer.

[0055] (3) respectively taking two groups of antibacterial hollow fiber laminates and two groups of hemp fiber laminates, stacking the two groups alternately, and hot pressing to form a fiber interlaced layer consisting of an antibacterial hollow fiber composite layer and a hemp fiber composite layer;

[0056] (4) Place the fiber interlaced layer into a rectangular enclosure with the antibacterial hollow fiber composite layer facing upward;

[0057] (5) The hemp fibers are combed, laid and needled. The formed initial layer of hemp fibers is immersed in glue and oscillated for 30 minutes. The fibers are taken out and placed in a rectangular enclosure and hot-pressed to cure and shape them. An elastic hemp fiber composite layer composed of microporous latex coated hemp fibers is formed on the front side of the antibacterial hollow fiber composite layer. The fibers are taken out and finely trimmed to obtain a hemp deformation-resistant multilayer fiber structure.

[0058] In this embodiment, the antibacterial hollow fiber prepared in Example 2 and the mortar prepared in Example 4 were used.

[0059] In this embodiment, the prepared hemp deformation-resistant multilayer fiber structure comprises, from top to bottom, an elastic hemp fiber composite layer, an antibacterial hollow fiber composite layer, a hemp fiber composite layer, an antibacterial hollow fiber composite layer, and a hemp fiber composite layer.

[0060] The thickness of the elastic hemp fiber composite layer accounts for 50% of the total thickness of the hemp anti-deformation multi-layer fiber structure, the thickness of the antibacterial hollow fiber composite layer accounts for 20% of the total thickness of the hemp anti-deformation multi-layer fiber structure, and the thickness of the two groups of antibacterial hollow fiber composite layers is the same. The thickness of the hemp fiber composite layer accounts for 30% of the total thickness of the hemp anti-deformation multi-layer fiber structure, and the thickness of the two groups of hemp fiber composite layers is the same.

[0061] Example 7

[0062] A method for preparing a soft and hard multi-layer fiber structure of ramie anti-deformation, comprising the following steps:

[0063] (1) The antibacterial hollow fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, an antibacterial hollow fiber laminate is formed; in terms of mass percentage, the antibacterial hollow fiber accounts for 80% and the high-elastic 4080 low-melting-point fiber accounts for 20% in the antibacterial hollow fiber composite layer;

[0064] (2) The hemp fiber and the high-elastic 4080 low-melting-point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed; in terms of mass percentage, the hemp fiber accounts for 85% and the high-elastic 4080 low-melting-point fiber accounts for 15% in the hemp fiber composite layer.

[0065] (3) respectively taking two groups of antibacterial hollow fiber laminates and two groups of hemp fiber laminates, stacking the two groups alternately, and hot pressing to form a fiber interlaced layer consisting of an antibacterial hollow fiber composite layer and a hemp fiber composite layer;

[0066] (4) Place the fiber interlaced layer into a rectangular enclosure with the antibacterial hollow fiber composite layer facing upward;

[0067] (5) The hemp fibers are combed, laid and needled. The formed initial layer of hemp fibers is immersed in glue and oscillated for 25 minutes. The fibers are taken out and placed in a rectangular enclosure and hot-pressed to cure and shape them. An elastic hemp fiber composite layer composed of microporous latex coated hemp fibers is formed on the front side of the antibacterial hollow fiber composite layer. The fibers are taken out and finely trimmed to obtain a hemp deformation-resistant multilayer fiber structure.

[0068] In this embodiment, the antibacterial hollow fiber prepared in Example 1 and the mortar prepared in Example 4 were used.

[0069] In this embodiment, the prepared hemp deformation-resistant multilayer fiber structure comprises, from top to bottom, an elastic hemp fiber composite layer, an antibacterial hollow fiber composite layer, a hemp fiber composite layer, an antibacterial hollow fiber composite layer, and a hemp fiber composite layer.

[0070] The thickness of the elastic hemp fiber composite layer accounts for 40% of the total thickness of the hemp anti-deformation multi-layer fiber structure, the thickness of the antibacterial hollow fiber composite layer accounts for 15% of the total thickness of the hemp anti-deformation multi-layer fiber structure, and the thickness of the two groups of antibacterial hollow fiber composite layers is the same. The thickness of the hemp fiber composite layer accounts for 45% of the total thickness of the hemp anti-deformation multi-layer fiber structure, and the thickness of the two groups of hemp fiber composite layers is the same.

[0071] Comparative Example 1

[0072] A method for preparing a soft and hard anti-deformation multi-layer fiber structure of ramie is basically the same as that of Example 7, except that the elastic ramie fiber composite layer is replaced by a ramie fiber composite layer of the same thickness.

[0073] Comparative Example 2

[0074] A method for preparing a soft and hard anti-deformation multi-layer fiber structure of hemp is basically the same as Example 7, except that: the elastic hemp fiber composite layer is replaced by a latex layer of equal thickness; specifically, the fiber interlaced layer is placed in a rectangular enclosure, and the antibacterial hollow fiber composite layer is facing upward; glue is directly poured into the rectangular enclosure, heated and cured, and a latex layer can be formed on the front of the antibacterial hollow fiber composite layer.

[0075] Comparative Example 3

[0076] A method for preparing a soft and hard anti-deformation multi-layer fiber structure of ramie is basically the same as that of Example 7, except that the antibacterial hollow fiber in Example 1 is replaced by the pretreated polyester hollow fiber in Example 1.

[0077] Comparative Example 4

[0078] A method for preparing a soft and hard anti-deformation multilayer fiber structure of ramie is basically the same as that of Example 7, except that: the method for preparing the antibacterial hollow fiber is as follows:

[0079] S1. Immersing the polyester hollow fiber in a 5 wt % sodium hydroxide solution at a mass ratio of 1:4, treating at 60° C. for 40 min, filtering, washing, and drying to obtain a pretreated polyester hollow fiber;

[0080] S2. The pretreated polyester hollow fiber is immersed in 20 g / L nano zinc oxide dispersion at a mass ratio of 1:3, and oscillated for 5 hours. After filtering, washing and drying, the antibacterial hollow fiber is obtained.

[0081] Comparative Example 5

[0082] A method for preparing a soft and hard anti-deformation multilayer fiber structure of hemp is basically the same as Example 7, except that: the preparation method of the antibacterial hollow fiber is as follows: the polyester hollow fiber is immersed in a zinc acetate solution with a concentration of 20g / L at a mass ratio of 1:3, and a 20wt% sodium hydroxide solution is added with stirring to adjust the pH to 9, and oscillated for 5 hours. After filtering, washing, and baking, the baking temperature is controlled to 155°C to obtain the antibacterial hollow fiber.

[0083] Comparative Example 6

[0084] A method for preparing a soft and hard multilayer anti-deformation fiber structure of ramie, which is basically the same as Example 7, except that: the obtained ramie anti-deformation multilayer fiber structure is composed of an elastic ramie fiber composite layer, an antibacterial hollow fiber composite layer and a ramie fiber composite layer from top to bottom. Among them, the thickness of the elastic ramie fiber composite layer accounts for 40% of the total thickness of the ramie anti-deformation multilayer fiber structure, the thickness of the antibacterial hollow fiber composite layer accounts for 15% of the total thickness of the ramie anti-deformation multilayer fiber structure, and the thickness of the ramie fiber composite layer accounts for 45% of the total thickness of the ramie anti-deformation multilayer fiber structure.

[0085] Quality Inspection

[0086] 1. The anti-deformation multilayer fiber structures of ramie obtained in Examples 5-7 and Comparative Examples 1-2 were used as test objects. The hardness and fit were measured according to the standard of T / SZFA 2003-2019, where the hardness grade is an indicator for objectively evaluating the overall hardness of the anti-deformation multilayer fiber structure of ramie, and is arranged from 1 to 10, with the larger the value, the softer it is. The specific test results are shown in the following table.

[0087] Table 1 Hardness and fit

[0088]

[0089] From the above table, we can see that:

[0090] (1) Compared with Example 7, Comparative Example 1 uses a hemp fiber composite layer instead of an elastic hemp fiber composite layer, which results in the hemp anti-deformation multilayer fiber being relatively hard and the fit being biased.

[0091] (2) Compared with Example 7, Comparative Example 2 uses a latex layer instead of an elastic hemp fiber composite layer, which results in the hemp anti-deformation multi-layer fiber being relatively soft, but having a good fit.

[0092] (3) Compared with Comparative Examples 1 and 2, the anti-deformation multi-layer fiber structure of hemp in Example 7 is moderately soft and hard, and has a relatively good fit.

[0093] 2. The anti-deformation multilayer fiber structures of ramie obtained in Example 7 and Comparative Examples 3-5 were used as test objects. The antibacterial properties were tested with reference to the standard of GB / T20944.3-2008. The specific test results are shown in the following table.

[0094] Table 2 Antibacterial properties

[0095]

[0096] From the above table, we can see that:

[0097] (1) Compared with Example 7, the pretreated polyester hollow fibers in Comparative Example 3 were not subjected to antibacterial treatment, resulting in a deviation in the antibacterial properties of the ramie anti-deformation multilayer fiber structure.

[0098] (2) Compared with Example 7, in Comparative Example 4, the nano zinc oxide attached to the pretreated polyester hollow fibers was easily washed away by the method of direct immersion in the nano zinc oxide dispersion, which affected the antibacterial properties of the anti-deformation multi-layer fiber structure of ramie.

[0099] (3) Compared with Example 7, in Comparative Example 5, the polyester hollow fiber was not pretreated, which was not conducive to the binding and loading of nano zinc oxide, and affected the antibacterial properties of the anti-deformation multi-layer fiber structure of ramie.

[0100] 3. The anti-deformation multilayer fiber structures of ramie obtained in Examples 5-7 and Comparative Example 6 were used as test objects. The air permeability was measured with reference to the standard of GB / T24218.15-2018; the thermal resistance was measured with reference to the standard of GB / T11048-2018. The specific test results are shown in the following table.

[0101] Table 3 Air permeability and thermal resistance

[0102]

[0103] It can be seen from the above table that the anti-deformation multi-layer fiber structure of ramie in Examples 5-7 has excellent performance in air permeability and thermal insulation. The air permeability performance of the anti-deformation multi-layer fiber structure of ramie in Comparative Example 6 is basically consistent with that of the embodiments, but the thermal insulation performance is slightly deviated, indicating that the setting of the fiber interlaced layer can improve the thermal insulation performance of the anti-deformation multi-layer fiber structure of ramie.

[0104] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft and hard multi-layer fiber structure of ramie anti-deformation, characterized in that: It comprises an elastic hemp fiber composite layer, wherein an antibacterial hollow fiber composite layer and a hemp fiber composite layer are arranged at the lower part of the elastic hemp fiber composite layer, and the antibacterial hollow fiber composite layer and the hemp fiber composite layer are arranged in two layers respectively; The elastic hemp fiber composite layer is composed of microporous latex and hemp fiber; The antibacterial hollow fiber composite layer is composed of antibacterial hollow fibers and low melting point fibers; The hemp fiber composite layer is composed of hemp fiber and low melting point fiber; The method for preparing the soft and hard multi-layer fiber structure of ramie anti-deformation comprises the following steps: (1) The antibacterial hollow fiber and the low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, an antibacterial hollow fiber laminate is formed; (2) The hemp fiber and the low melting point fiber are uniformly mixed, and after combing, web laying and needle punching, a hemp fiber laminate is formed; (3) respectively taking two groups of antibacterial hollow fiber laminates and two groups of hemp fiber laminates, stacking the two groups alternately, and hot pressing to form a fiber interlaced layer consisting of an antibacterial hollow fiber composite layer and a hemp fiber composite layer; (4) Place the fiber interlaced layer into a rectangular enclosure with the antibacterial hollow fiber composite layer facing upward; (5) combing, web laying and needle punching the hemp fibers, dipping the formed initial layer of hemp fibers in glue slurry and oscillating for 20-30 minutes, taking it out and placing it in a rectangular enclosure, hot pressing and curing it to form an elastic hemp fiber composite layer composed of microporous latex coated hemp fibers on the front side of the antibacterial hollow fiber composite layer, taking it out and finely trimming it to obtain a hemp anti-deformation multilayer fiber structure; The preparation method of the mortar is as follows: weigh 70-80% of natural latex, 20-25% of nano zinc oxide, 1-2% of calcium chloride, 1-2% of sodium bicarbonate and 0.5-1% of sulfur by mass percentage, and stir them evenly to obtain the mortar.

2. The soft and hard anti-deformation multi-layer fiber structure of ramie according to claim 1, characterized in that: The thickness of the elastic hemp fiber composite layer accounts for 30-50% of the total thickness of the hemp anti-deformation multilayer fiber structure, the thickness of the antibacterial hollow fiber composite layer accounts for 10-20% of the total thickness of the hemp anti-deformation multilayer fiber structure, and the thickness of the hemp fiber composite layer accounts for 30-60% of the total thickness of the hemp anti-deformation multilayer fiber structure.

3. The soft and hard anti-deformation multi-layer fiber structure of ramie according to claim 1, characterized in that: The low melting point fiber is high elastic 4080 fiber.

4. The soft and hard anti-deformation multi-layer fiber structure of ramie according to claim 1, characterized in that: In terms of mass percentage, in the antibacterial hollow fiber composite layer, the antibacterial hollow fibers account for 75-85% and the low melting point fibers account for 15-25%; In the hemp fiber composite layer, hemp fiber accounts for 80-90% and low melting point fiber accounts for 10-20%.

5. The soft and hard anti-deformation multi-layer fiber structure of ramie according to claim 1, characterized in that: The preparation method of the antibacterial hollow fiber is as follows: S1, immersing the polyester hollow fiber in a sodium hydroxide solution, treating at 50-60° C. for 40-50 min, filtering, washing, and drying to obtain a pretreated polyester hollow fiber; S2. Immerse the pretreated polyester hollow fiber in zinc acetate solution, add sodium hydroxide solution to adjust the pH to 8-9 with stirring, and oscillate for 5-7 hours. After filtering, washing and baking, the antibacterial hollow fiber is obtained.

6. The soft and hard anti-deformation multi-layer fiber structure of ramie according to claim 5, characterized in that: In step S1, the mass ratio of the polyester hollow fiber to the sodium hydroxide solution is 1:4; and the mass fraction of the sodium hydroxide solution is 5%.

7. The soft and hard multi-layer fiber structure of ramie anti-deformation according to claim 5, characterized in that: In step S2, the mass ratio of the pretreated polyester hollow fiber to the zinc acetate solution is 1:3; the concentration of the zinc acetate solution is 20 g / L; the mass fraction of the sodium hydroxide solution is 20%; and the baking temperature is 155°C.

8. The soft and hard anti-deformation multi-layer fiber structure of ramie according to claim 1, characterized in that: The water content of the natural latex is 50%.

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